Tried blind squonking with atty yesterday and stopped squonking when I first heard gurgle and this worked. Didn't flood my atty all day and no excess juice in cup. Did this with 510 and 306 atty. Finally got hang of it but it was the tip about listening for the sound of the first gurgle that did it for me, the pressure thing didn't work. So now I'm going to try with cart tomorrow. Thanks to all for help.
Yay!!! Now that you've got the feel of it, it will be easy to maintain.